Instore at Asda these showers are £30.
OH has just replaced our old Triton Opal 2 with this successfully.
It is only a 8.5 KW but we were struggling to find a replacement shower with the same entry points and (more importantly) the same connection points.
Tesco's have this shower online for £50.
Have tried it and its fine. Only has a single action showerhead but we just re-used the showerhead and riser rail we already had.
2 yr guarantee also
Hope this helps someone